Road status and access

When you pull the land register (登記簿) for a Japanese property, the first thing you look for is the road entry. In Japanese property records, road status is not a single field. It is a legal conclusion drawn from several official layers: the cadastral map, the land register, the building confirmation file and the municipal planning certificate. The question that matters is whether the parcel has legal access to a public road under the Building Standards Act (建築基準法). Without that access, the parcel is treated as unbuildable even if the zoning and area figures look viable.

What the Building Standards Act requires for road access

The Building Standards Act sets the minimum rule for a buildable site. Article 43 requires that a building site must adjoin a public road at least 2 metres wide, unless a special permission (条例による許可) has been granted by the local government. This rule is often called the “road frontage requirement” (接道義務, setudō gimu). The road must be one of the categories recognised by the Act:

• Public road under the Road Act (道路法)
• Road under the Urban Planning Act (都市計画法)
• Road under the Land Readjustment Act (土地区画整理法)
• A road recognised by the prefectural or municipal authority as having the same function (e.g., a private road with a recorded position)
• A private road that meets the width and construction criteria set out in Article 42(2) of the Building Standards Act (建築基準法第42条2項)

A mere right of way, a farm track or a privately owned passage that has not been designated under the Act does not count as road frontage for building permission. The classification determines three things: whether a parcel is buildable, what setback applies from the road boundary and whether the building can be connected to public utilities.

How to check the road category yourself

Do not rely on a single document. Cross-check four sources in this order:

1. Cadastral map (地図) at the Legal Affairs Bureau (法務局). Look at the parcel boundaries. Confirm whether a road line touches the parcel and measure the frontage width shown.
2. Land register (土地登記簿) at the same bureau. Check the section on land category (地目). If the adjoining strip is registered as 公衆用道路 (public road) or carries a recorded easement, note the registration number.
3. Urban planning map (都市計画図) at the municipal planning department (市町村都市計画課). Identify whether the road is classified as a planned road, an existing public road or an undesignated private passage.
4. Planning certificate (都市計画証明書) from the same department. Ask specifically whether the road meets the Article 42 definition. Request written confirmation of the road category and the applicable frontage width.

If the road is private, ask the planning department two direct questions: “Has this road received a road-access certificate (道路位置指定)?” and “Is a road position reservation recorded on the parcel?” A private road without a registered easement may be unusable for redevelopment.

Frontage and setback rules

Under the Building Standards Act, a building site must generally front a public road at least 2 metres wide, unless it meets specific exceptions under Article 43. The width is measured between the road boundaries shown on the official cadastral map, not the paved surface. If the road is narrower than 2 metres, the law requires a setback from the centre line so that the building line meets the required width. This setback is recorded in the building confirmation and reduces the buildable area.

The Ministry of Land, Infrastructure, Transport and Tourism (MLIT) publishes the current Building Standards Act enforcement order. The operative text is on e-Gov Japan. The width threshold and setback rule are set by national law, not by individual municipalities. Municipalities may add stricter local rules under the same act.

What to measure and where to mark it

• Measure from the cadastral boundary, not the kerb. Go to the site with a copy of the cadastral map. Use a tape measure to mark the legal boundary line. If the paved surface is narrower than the cadastral road width, the cadastral line still governs.
• Mark the 2-metre point from the centre line. For a road under 2 metres wide, find the centre line on the cadastral map. Measure half the required width outward from that line. That is your minimum building line.
• Record the setback on your site plan. The building confirmation application must show the setback line explicitly. If you skip this, the application will be rejected at the plan-check stage.

Private roads and access rights

A parcel that does not front a public road may rely on a private road (私道). The Building Standards Act requires a site to abut a road of at least4 metres width, or to meet the specific exception in Article43. The private road itself may be recorded as an easement or a shared ownership interest in the land register.

Before you commit to a purchase or a design, verify three things:

1. Ownership of the private road. Pull the land register for the road parcel itself. Is it owned by a third party, shared among neighbours or held by the municipality? If the owner is a private third party, ask for a copy of the recorded easement or access agreement.
2. Road-access certificate status. Ask the municipal planning department whether the road holds a road-access certificate (道路位置指定). Without it, the road has not been confirmed as meeting the Act’s width and layout requirements.
3. Setback and reservation lines. Check the urban planning map for any road position reservation (道路位置指定) that would push the building line further back than the apparent boundary.

The local government planning department issues planning certificates and zoning confirmations. The Legal Affairs Bureau maintains the official land register and cadastral maps. Use both offices for every parcel you evaluate. A parcel without confirmed, legally recognised road frontage cannot lawfully be built on, regardless of what the zoning map or the sales brochure shows.